Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e3ae47bedc33a22847ef5c7a94b743dce47a146811f3e1c8bbfb1eb46bd0b59' 
  AND token = 'r0dUxenbkv89GWSMtS/i24ij5DB68WcVVVsNpoY/QBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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