SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1edfaa211bfbb60ad975b74285c5c809a00a66523b324bc13ba32f9694267ee' 
  AND token = 'dDlVKER9ANTPZOvNxGYcCW7IBjro4PqlbM9raTzv8aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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