SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ad7cff05433ab4e7ef94538967c6229b7cd7ee37bf46274320d7eed95b2bdc3' 
  AND token = 'pN2lemqw+UQjgbiuTY4OVvBsf1T7k5L/tVlZvHBGTYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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