Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3fe9a7930ffd0d987903e5b663641096adb20bcfca7acd05a35a8fd91cab59c' 
  AND token = 'F3gUXjI4PWbMETHdl60Y8NE/uciNFgWIw2nUNIwk2Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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