SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98ddefc12c29910aac06010da826794641f2cd856863ba8a43dbec5b251356da' 
  AND token = 'T42+qxgkfulPjXtniDv5LKuQGGOC9QFrD3rfrZPq/1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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