Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5120e64fc4b0102509470c52a5eec75a03061e274a7f053ee8a2ba9f31fef540' 
  AND token = 'jKAPsH6YJHxeUtdx6ZJiGc6J3L8C2oQejk/MgyiXcfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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