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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18faa9724adfe01d5a620277d5e97c791cc4631b30357d683ad2c2b00ff4a87c' 
  AND token = 'l274i6ROtFJCIZKh2Peh7LG3mSkK8ZeGP0QNZjec5tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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