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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dfa6d81de3cbef6d8e879dc0ff394893b277490488cae9db0a2966df0eacbf0' 
  AND token = '1e5wdB3813C8QTsBoiS3yqoYNRUZPEbkPEQpOneNQ0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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