SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c267091fe085e2c91d8c33e7fd7c8c5ded1b99843754f8f50df4970d4aaa1b7' 
  AND token = 'aiZwumUay1dYglFuX1e6kgIguH6Ax306PrqCvz5ojxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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