SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a4d188931cd3354d1969440d1c165a8f21ba5e05594d35267f513003cf3a0d6' 
  AND token = 'HzBT6FKwEjm6UiYjo7NZgmEUfhg5SucMl0HFGu1U68E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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