SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa3258267efefd2464d9f5dc06cbf137ecb14e54d4b064d45c70bfda395ad628' 
  AND token = 'qkF58OdXGqQVh3UwFoUf9JFglw5y0AlSuJyHzuNNO7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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