SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1304cad8f5566e866b7923ea01ea1c38306485f98a4d0f2c027477afcb2d6034' 
  AND token = 'dP0EKRrOhTFh33Gd3FQVWQUF71Ng+bTAsvHJpmnbPlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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