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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'daea4ebf1e20647a30f1f7c52653699af2c0d97fa77db5e0dae37bd436261a99' 
  AND token = 'JLqIoEn2rjM7e14mCaNUGE9YnOVj7YbTdyDBEkB1evc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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