Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3264e046ef603026da2d24f1a9d4bc356ee183adb1ebeaf739d36c9d8bc1ba8' 
  AND token = 'SIrC/75OlMZ+gJfgjnEAxrar9CG9CTa5WfLksR5WG9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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