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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a36ca5ed3ddda41ede687115c84942552898172535e82dee9c21407cc918f80' 
  AND token = '9sIsw9khaZOZQVrxB2KcGPdVNXio8NlDnvCNf8hcWXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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