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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc7b525f4bc0ef1ec7c43affa85303b9e6d8d860dbfd772a0baf40286e2d9573' 
  AND token = '1qxwU0Ydca2EfjteepoOodZX07tinRzZX5RYJZOO0G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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