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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67f13a5530db7ad0f37872312b87e6ac06cad2cbbe5ec21b4821c6591d2908ad' 
  AND token = 'k4nO3OOP+y8th1Mwjcz55ZWL6n/WbnKJ0nkR2gV9doQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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