That's a pretty pocket and a dangerous flop for you. Being first to act, you needed to bet something and you got the information you were after. You do have to fold the hand. AK is still just top two pair drawing to a hopeful boat. If you got a big reraise facing you, you're either playing against a donk/crazy bluffer or you're beat. There are a lot of hands that could beat you and with more information, maybe I could provide a better answer.
Table situation and preflop action would be what I am most interested in. The thinks like Storm mentioned. With AK, I do hope you raised preflop. Depending on how much would help to limit the range of hands your opponents might have. If you raised enough they are bound to have atleast faces. They could have the set of As, Ks, or 10's or played JQs and lucked into broadway. If they were playing a pocket pair or Q's or less (except 10's) you expect them to fold to an aggressive cbet post flop.