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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bac73a442656cfd06ed2f4f39e537a2aa998e1eb0a55ca17992fee8047177245' 
  AND token = 'Y6RAa8qM3hC6h6OPS3KVL4oHtuo+qskafOrpf8qXLjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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