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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dbc8ffee21ac1f8eeca4e441ee8cade29d896789e61e24db48061bd6a325276' 
  AND token = 'PkriPaf3RM2rBX98329d7O78jqKDzgFJ6P5O77RJ9XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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