Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c64baffdfba61d01ca52ce3bc9b4d8e92a10548f66b6be54610f9a7295cd785d' 
  AND token = 'tkaZpvee9iGlpKHbWSFAbcuYXe9mSWNMiogI1Tg0Gxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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