SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d67dc8825f3573a9f63b4405f4dfa78397c5208288d56faa2d472e5b9ed30b6' 
  AND token = 'JCDKzsOG9AFRG+zMamE7BXucv5hBJBQ9UCn1klOPOzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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