SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28154fbc56020b4ea8f42bbd5432fc0a59e1a4ae0c1c736b578b5dfbaf6fe065' 
  AND token = 'ZoM767pYHJo+5gZbbUu/z/rEd3q/rNILQXbgNovGlP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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