SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9900f2196b1eae0144805befeb549df216013bd4354d851244d50f49a83d0783' 
  AND token = 'X3TE9DFszn/31HLqKiKliU4RGiBYzsFkhrFwBSeEQAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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