SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '429379594b165a31c5d23f04bbc519a5308eb52b07f380eb8682fa6438e0fd36' 
  AND token = 'q+Di7IZoUPgCnxnSMWG+tEOuG/K8rWvDFUoHokLiu+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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