SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6e4f3465c12c957ae0524cd3df738b23ef2c73bbb543fef8d673114e0a0d979' 
  AND token = '/fZJq8eOGC4QWvuxqNstUfJrxypl9Ybftg1LzqSIb50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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