SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '544e3f2ddb9a58930ad7443217ad377823c871555a45506cdc35bcb2423f2dd2' 
  AND token = 'gzFhPAOg1t88WliVJjkls/sBvCrot/nuvzAWGIGFZhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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