SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bb66c032c044cc5f34ea975c3219406f11593db31b8a6fa51fc200164a6e640' 
  AND token = 'Zu1gmrkjuiHsbVnxzbBVryqldC+H2a7+ClskTQYdqQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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