SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '785851def1c9ce63f3cdb9699ed11c9d6d701f616559d3cbbcad65aaf0451b33' 
  AND token = '4s8yLFDZVBgXo2WVw/xv2/spErA57TfPiqEh/6TBCso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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