SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ef55c7e8a1620ed69186bf7577f7892e8a6a45069b24abe869adf1d867ea1fc' 
  AND token = '/qoD4WdfKoVAUal0Dux0OE+FqywJLIbRxZRjRBq3Fmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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