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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d74a9e1a2c8da7f7030e1be6223ef46708afb9398722a658a90bbaf85129d84' 
  AND token = '/DijU9Cra1fQcb7k/eF6VO7HgmrZHE16mtDpuCHx5og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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