SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c80147e709e842e99c9f62ffa98c94ac8be50ca43b9f77b62bca3ca24646437b' 
  AND token = 'tPXsMwg6KVQFw18MlLHPOYTG0BjUxc2x6Eki6XKzZrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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