SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d83d6307b775f2f0f2cc93e35c4f6d38e9849b65ba60244e2deb1265165d4f7' 
  AND token = '5oyJrvCP/2/J/gvzmRaHHffNHfnx7rQhMuvKWBS3fc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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