Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c49b5ca23fed1797e749156ffc7331cbbca97a03ebe6b74948ee7ab581d8187c' 
  AND token = '03VPsnZ3hk3xCzrqTDrGt+LsbMaIZcz7DKqQU9AHZzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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