Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1cf6109f7263cfac24b90726bb2ffd359bf4fef662f4ba0fe2e84d74c9a7985' 
  AND token = 'NM4uQrZMLMyBZvS4AnZ5so6Z7QjvjXNNDmF56aUl/38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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