SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '803fea09a23d3a4e2157ef6010b485aff763c8b78c765308f33bb368f5b82091' 
  AND token = 'KSAx5hBYyrQJhjk6poXhu2aq2P3VGxZLZF6kA86c/yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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