Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd48d609f1c6a0e2c6271194665a304e661d1fd6579369e53cc6060224c2899a1' 
  AND token = '6VmYbQjb7+mrcld9zNkXBmalnxEz2zJeby+DSyc+pEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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