Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c9ed0209cd6a41af48622904f9269eb11f306c2159e181fcffe7c9488779cf2' 
  AND token = 'GY9W/7PIiWN1JN2HoIj3daaEuqaQGVkUlvo2SaFf1Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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