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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5998713398bdc736cb979a9212557ceed3462ff6827888f33b8bb42a8f06fae5' 
  AND token = '5py0EfYqtSncpYBJd9vL6eD1lBHddZQDPkx5xJg33Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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