Correct play on AK?

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I love my Ak's however unsure as to the correct play here. Obviously flop did not help me and I put him on a fairly powerful hand. Opinions?

PokerStars 0.25/0.50 Hold'em (8 handed)

Preflop: Hero is CO with K[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="CC3333">UTG raises</font>, UTG+1 folds, MP1 folds, MP2 folds, <font color="CC3333">Hero 3-bets</font>, Button folds, SB folds, BB folds, UTG calls.

Flop: (7.40 SB) 7[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="blue">(2 players)</font>
<font color="CC3333">UTG bets</font>, Hero folds.

Final Pot: 4.20 BB