SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a299519c84f8d24e61d997c239ed40a86269fd8fdf05cd93fee259785674272' 
  AND token = 'wS1DYU5jqXyo4bttAe3+VB2TNMtmXLoJYaPKjq4ZgeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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