Playing AK when you hit

Sometimes it's easy to worry too much about sets when playing AK and hitting top pair. In this hand I worried about a chase.
Read on player UTG+1: Quite loose, tend too chase flush and straight too often. Any comments to the chase here :?: He has some extra outs after the flop.

0.25/0.5$ NL 10 player

Dealt to Borax in CO:
:ac::kh:
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OpeningBetRound
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SB : Posts small blind 0.25
BB : Posts big blind 0.50
UTG : Calls for 0.50
UTG+1 : Calls for 0.50
UTG+2 : Calls for 0.50
MP1 : Calls for 0.50
MP2 : Folds
MP3 : Calls for 0.50
Borax : Raises for 2.00
Button : Folds
SB : Calls for 1.75
BB : Folds
UTG : Calls for 1.50
UTG+1 : Calls for 1.50
UTG+2 : Calls for 1.50
MP1 : Folds
MP3 : Folds
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Flop
:td::as::3s:
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SB : Checks
UTG : Checks
UTG+1 : Bets 4.00
UTG+2 : Folds
Borax : Raises for 15.00
SB : Folds
UTG : Folds
UTG+1 : Calls for 11.00
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Turn
:4d:
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UTG+1 : Checks
Borax : Went all-in 43.32
UTG+1 : Went all-in 19.60
Borax : Receives returned betting money 23.72
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River
:ah:
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Showdown
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Borax
:as::ah::ac::kh::td: - Three of a Kind
UTG+1
:as::ah::td::ts::8s: - Two Pair
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Result
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UTG+1 Showed Cards
Borax Showed Cards (Winning) 77.70
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