Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b576d28c10adb4dc31273559232d103d8d2011dd270b5b542f9713bb4da295b' 
  AND token = 'TLzTCursG/Zr5Lw557S+jNnQeIXx109OdEhYoucry6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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