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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55862d80b5144959cd98ca6da35dfc2d4c58b741ea2b368c8d428f5934dc7f37' 
  AND token = 'XWqcfAI71EuT+5Rin31FTbJ82B6xiemGKgxwQXkD+4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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