Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a6a171663f8be3c724bc19166c51d056a0572cbc0969c0acbec1bc750db7b21' 
  AND token = '/3H88nccEU/I/Wpb91/igAvxuloXQdK+geWYnTewtkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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