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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1497743505a94c87cc77a97565f977a433a70e83f626463dd67389ecb784e740' 
  AND token = 'zSh+yKXEWq1bdSTh6Pt2PJcMf1SPTxZjxLUNTrxny3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}