Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9147ceb6d54081f977727a8d2b6c20e93a942bf48fe398b47e9a62dd8be2c8f' 
  AND token = 'deJYa1G+oa0TU3+T4ha56f6WGiyZeJ08sg6eMIs2ZB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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