SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e996514bec3b3d90addfd06fc2f97dfc9fb72937a1fd2cad8873407f144cf3f7' 
  AND token = 'y/oN8+L/TE1I4wYq2qiVZlH3CsvyDlVpNhsNHh+aPzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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