SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdccc008b2cc0c53779aa321292ff79204745e46dcd3bb0a87261ee79ec6bc26' 
  AND token = 'Tu+TVvoZy8XUYwqvLz8lMEb3F/AEB0iT4Kwd+bIE6xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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