SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01a9652bfa3b1997041b074d5f8767cba28f9c765c72e917b910988d7be2f7de' 
  AND token = 'YVWClTpNrzDMEmWtiaPciHjZXJJwunZ9YksbTICm/4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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