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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c94cac27f8433e9e6f047fa71efcd7bfd40e37ff5355c02b2408f8453ac4ba8' 
  AND token = 'Qnu/7ruh4Os0SkuhmmfCgRqggX+UfsOCcQUkfX/nN9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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