SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '670e511d104e6f8cd62208ce1532f36d3dc03424d930e8d0973753058fa96b38' 
  AND token = 'qYI7wxSB1kIBIZ1EgwIzxwHEcXY+Iv2CrO//MAdQ1Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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