SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a67ea82306960ef458f911b462487eac6201faf1b83cfb4aa3cd19b432758f3' 
  AND token = 'LpiQMHDMQ/mmwZHSnw9eybq4pq1NvFx2CQ7hgD+Ywf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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