SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d7fcef841933d6d13122168ce15842c13afaec9d35334b7f4d91a397a812b7f' 
  AND token = 'KcjR3zGdlQDGMYTLX7I80hXqMLQs4S+I6mx79/2vIUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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