Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5e7b5f7c16dea96b50745a0caf3a67975c350069ef1ebc100f299e5a510cc59' 
  AND token = '9xWwGsi/RRDNtp7vgTPvUssFtJQAvnopAS1MpBsQ1Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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