SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd96dc7372234821df2fb4d148290273f939120de6c9b4034fe11f3f85763e1ec' 
  AND token = '2HCmYyEX4VjvVQt7kr+NBr03KoQjDqwt+SfdFVl9Kng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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