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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6059faf085775b422ebf812402dca31be1a39ccc1c3ce1ff7a0dc975a6f3521a' 
  AND token = 'DU1jCKZzRkpXdbobnqe+Xu5Rz/IaqgCr17aefs5FPXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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