SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b455a032c4105d3bc4842afba7f978193d99d06a640087ea3952798386a2a745' 
  AND token = 'axRubBwNeHHMT04G/CxZ/wQw8mQzGVkZT7bBVYT8oxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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