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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd495cbb87c75f6d92c86af427b5f5d9a6fc8a9306c3a44c9e90f4bc9b70814de' 
  AND token = '6lJwXCglY3NEccx8/tvIHfgOpXoER2xE082OAuC3gjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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