SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af35b6be70566157820d3f7e0ac8a9966203354358c10ba695b813aa8e99fae5' 
  AND token = 'OiUgBtFZAP+4Z8NHj+mLjNC/scsWZtdFtz72bGFqC7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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