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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c3b062699276147405c762fc5da98bf3b687ef35f518b97d38a25f7a3de8181' 
  AND token = 'EFUCZnNOFMWBkMaWyxDBjSkp9P0yXPnIXHpQWMrk7gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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