SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd30bb53403b8bef38364b672f1b8bd4860a379edde497a2b8686f3c74d67e1f' 
  AND token = 'n7M2UqvOWxGim6zmf9MzD+Pmadm84pVohMZX/BAfstU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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