SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f4e1a71c1b74e0d41a5785fbe753fcbfc23b870c580988d820ddc57cb1a0ef9' 
  AND token = 'ELw1caPIZUs0FjRI6HGpHEyuw/tgL6NoKOsqvYXBo0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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