SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56f3561148b31075185249f95f6b4bae96c1020509303d27de43a7dfa796758d' 
  AND token = 'HSkLAJH3j7CPZpU11QxFyD60JxzLoW+9h1FdnJDcTUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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