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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '249cf7bed9383b7f651cc29d73d3233fab70e92490b88612e099c52ea8dda425' 
  AND token = 'hod39CbpHuUBtX9mgTz1Y38wPfDjh4iugkoLtfNkSiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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