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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fd37e5860c3e4d6ece8524a8057cbea716db50b20ce62e243edceccefa56a07' 
  AND token = '1WJt/Odp4qtnXlBaFvss519qKWFjinUeb2ruS1nEm7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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