SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1a4b5ff032665f3d592e7766f192c974c4f259065f5fb37b5fd69273e3b04e2' 
  AND token = 'hCUKMdD5z/h0SjXtnj+20SOjKvbNa/pUIkrtZIQLALs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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