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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5cbcc469ae95334c0228bf64cf58ba492d48d33f132c50658b26f9ed06e229a' 
  AND token = 'LopnV6IqEejW7B3ze9W65QNbjIN8B9jV2SujLH5frRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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