SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab05b05c261222ba33eb460bc8d03034ef761ea93029bbb6e1998d8d7b1867b1' 
  AND token = 'hCQPRB6vK4tVJYkNZ/JfbrjOLwPhpHTRBgNDFYmhc/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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