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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dd84d333a4fd6ccd2dc59b8832bdcadc673d2368ed1a003b525a733da0a9ca8' 
  AND token = 'ksM6z1xY7nwjF9hMlrU0DWnH8VKMUq9I6IZ4qMS2TXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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