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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20849510ef1dfc97bc9b215d212ae353a00e20b671d44fdb640f7c436f411689' 
  AND token = 'mJpFLTcBGyt/726tuxd1/zENxBvhNTATu7O14kfx6XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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