Is it ok to just check-fold here? It seems like any good opp could reasonably expect that we would beat on that drawy type of board with Ax hands.

Opp seemed reasonable over a small sample, running at 19/19/inf over 26 hands.

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

CO ($30.30)
Button ($16.45)
Hero (SB) ($26.55)
BB ($5)
UTG ($25.70)
MP ($25.10)

Preflop: Hero is SB with K, K
UTG bets $0.75, 3 folds, Hero raises to $2.70, 1 fold, UTG calls $1.95

Flop: ($5.65) Q, 2, A (2 players)
Hero checks, UTG bets $4.75, Hero folds

Total pot: $5.65 | Rake: $0.25