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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73d031d06e91286a88c06bea37b50d7f93c9291b9234bff669230b7aae2ae1d6' 
  AND token = 'nWqBvucjT8pDq7JIIUHwL0eX9txMgbbTDo8THgkB82g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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