SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7b9e3c9f442c688f50730979d4e6108e3d92303abc35916484bb710c2e8a642' 
  AND token = 'wA2NE+/Mxl7sF4lZUKYs0Rh9fJITgrMIfgdyq1bx43E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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