SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f151a4c886fb4755dfdbcc247eb3d58f3c0a9e3e7ed82f4452caaa3181b7c365' 
  AND token = 'ghzLQZxUZsqhh4Dp2u+gRzHykboPvoxiE8Zh/2pY7bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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