TPGK vs straight forward player

Villain is 15/6/1.8 AF w/ a 3bet of 1% over 1K hands
Never seen him get outta line. Plays ABC and I havent seen him get to showdown hardly ever.

No-Limit Hold'em, $0.25 BB (8 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com
MP1 ($15.02)
MP2 ($19.55)
CO ($23.89)
villain (Button) ($21.84)
SB ($25)
BB ($22.58)
Hero (UTG) ($30.77)
UTG+1 ($20.30)
Preflop: Hero is UTG with A, Q
Hero bets $1, 4 folds, villain calls $1, 2 folds
Flop: ($2.35) 2, A, 6 (2 players)
Hero bets $1.57, villain raises $4.32, Hero ?

On the flop I give his reraising range as:
22, 66, AT+
Stoving this gives me 49.3%.....
I believe he flats AK pre given his low 3bet % so I can be against better A's.
There are no draws for him to semibluff that I believe he calls pre with (like 3,4) so he's either doing this for value, or he is bluffing which I haven't seen him do (or at least get caught doing)I really dont think he raises A9, A7 etc....and I doubt he calls pre with that anyway. It was a really tough decision for me on this one.

Thoughts?