SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c1bfa5dcd339264b27ba8d0ad027a3a6e6649739571e23f6f946a3357144e9f' 
  AND token = 'QbXtBbON7/AuJE+C4QmdZj8jhywWiyFq81pRSrxVz1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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