Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8b44310108878be583848bcfd2590c2c3ba8a397ea24c7ac462300555b51943' 
  AND token = 'yoz7smpl4spZw5YpNZotqHtDR/K3be1xP1RTxU0e/vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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