SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5296a7fe92e0b340a4d40ea126ad21a4b004af07afb86d3824a816223b182ee1' 
  AND token = 'KI4hlD218wK5/+jqj3IzZBqcEQYQAGy1v3KFo07B0Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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