Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afdb3784ebbbdf3494a37d87d1f51c2ad0d5cda9f3bb2de65c3e2262ec201af2' 
  AND token = 'LG+n+yDogs8jD+qpGQhWCGqBMT82aiONniLMqYdHIto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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